code: def testUTF8StringPathExists(self):
      file_path = os.path.join(self._base_dir, "UTF8测试_file_exist")
      gfile._write_string_to_file(file_path, "testing")
      v = gfile.exists(file_path)
      self.assertEqual(v, True)
  
imports: import os.path
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import compat, errors
  from tensorboard.compat.tensorflow_stub.io import gfile
label_desc: Use image node_id 23 for calling the FileIoTest obj's underlying member method code with example usage: obj.testUTF8StringPathExists() without return types